Ultraviolet irradiation promotes FOXP3 transcription via p53 in psoriasis

Experimental Dermatology
Dongmei ZhangZ Shen

Abstract

The decrease of forkhead box P3-positive (FOXP3 + ) regulatory T cells (Tregs) causes an immune imbalance with effector T cells in psoriasis. Previous studies have demonstrated that in addition to its known effects on keratinocytes and effector T cells, ultraviolet (UV) irradiation alleviates psoriasis via the upregulation of FOXP3 + Tregs. However, the mechanism is unclear. Here, we found that FOXP3 + T cells were increased in psoriatic lesions after UVB irradiation (t' = 3.7006, P < 0.01), as determined by immunohistochemical staining. In addition, the levels of FOXP3 and p53, one of the downstream targets of UV irradiation, showed accordant changes after UV irradiation. Experiments that used a MAPK inhibitor, p53 mutant cell lines, p53 inhibitor and p53 shRNA showed a decrease in FOXP3 levels, suggesting that p53 is required for UV-induced FOXP3 transcription. Next, we demonstrated that there are two binding sites for p53 on FOXP3 by informatics tools, a dual-luciferase reporter assay and chromatin immunoprecipitation (ChIP) assay. One binding site (-1771 to -1583) is located at the promoter region and is adjacent to a previously reported p53-binding region in breast cancer cells. The other (+3845 to +4042) is located within...Continue Reading

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